Darunavir is an antiviral medication used to treat HIV infection. It belongs to a class of drugs known as protease inhibitors, which work by blocking the virus's ability to replicate in the body. This helps to reduce the amount of HIV in the bloodstream, allowing the immune system to recover and function more effectively. Typically taken in combination with other antiretroviral medications, darunavir is prescribed for both treatment-naive and treatment-experienced patients. It is important for individuals taking darunavir to adhere to their prescribed regimen to maintain its effectiveness and prevent the development of drug resistance.